PATJetSlimmer.cc

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//
// $Id: PATJetSlimmer.cc,v 1.1 2011/03/24 18:45:45 mwlebour Exp $
//

#include "DataFormats/Candidate/interface/CandidateFwd.h"
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/EDProducer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "DataFormats/PatCandidates/interface/PackedCandidate.h"
#include "DataFormats/Common/interface/RefToPtr.h"
#include "CommonTools/UtilAlgos/interface/StringCutObjectSelector.h"

#include "DataFormats/PatCandidates/interface/Jet.h"

namespace pat {

  class PATJetSlimmer : public edm::EDProducer {
    public:
      explicit PATJetSlimmer(const edm::ParameterSet & iConfig);
      virtual ~PATJetSlimmer() { }

      virtual void produce(edm::Event & iEvent, const edm::EventSetup & iSetup);

    private:
      edm::EDGetTokenT<edm::Association<pat::PackedCandidateCollection>> pf2pc_;
      edm::EDGetTokenT<edm::View<pat::Jet> >  jets_;
      StringCutObjectSelector<pat::Jet> dropJetVars_,dropDaughters_,rekeyDaughters_,dropTrackRefs_,dropSpecific_,dropTagInfos_;
  };

} // namespace


pat::PATJetSlimmer::PATJetSlimmer(const edm::ParameterSet & iConfig) :
    pf2pc_(consumes<edm::Association<pat::PackedCandidateCollection> >(iConfig.getParameter<edm::InputTag>("packedPFCandidates"))),
    jets_(consumes<edm::View<pat::Jet> >(iConfig.getParameter<edm::InputTag>("src"))),
    dropJetVars_(iConfig.getParameter<std::string>("dropJetVars")),
    dropDaughters_(iConfig.getParameter<std::string>("dropDaughters")),
    rekeyDaughters_(iConfig.getParameter<std::string>("rekeyDaughters")),
    dropTrackRefs_(iConfig.getParameter<std::string>("dropTrackRefs")),
    dropSpecific_(iConfig.getParameter<std::string>("dropSpecific")),
    dropTagInfos_(iConfig.getParameter<std::string>("dropTagInfos"))
{
    produces<std::vector<pat::Jet> >();
}

void 
pat::PATJetSlimmer::produce(edm::Event & iEvent, const edm::EventSetup & iSetup) {
    using namespace edm;
    using namespace std;

    Handle<View<pat::Jet> >      src;
    iEvent.getByToken(jets_, src);
    Handle<edm::Association<pat::PackedCandidateCollection> > pf2pc;
    iEvent.getByToken(pf2pc_,pf2pc);
    
    auto_ptr<vector<pat::Jet> >  out(new vector<pat::Jet>());
    out->reserve(src->size());

    for (edm::View<pat::Jet>::const_iterator it = src->begin(), ed = src->end(); it != ed; ++it) {
        out->push_back(*it);
        pat::Jet & jet = out->back();
        if(dropTagInfos_(*it)){
            jet.tagInfos_.clear();
            jet.tagInfosFwdPtr_.clear(); 
        }
        if (dropJetVars_(*it)) {
            //             jet.setJetArea(0); 
            jet.setNPasses(0);
            //             jet.setPileup(0);
        }
        if(dropTrackRefs_(*it))
        {
            jet.setAssociatedTracks(reco::TrackRefVector());        
        }
        if (dropDaughters_(*it)) {
            jet.clearDaughters();
            jet.pfCandidatesFwdPtr_.clear();
            jet.caloTowersFwdPtr_.clear();
        } else if (rekeyDaughters_(*it)) {  //rekey
            //copy old 
            reco::CompositePtrCandidate::daughters old = jet.daughterPtrVector();
            jet.clearDaughters();
            std::map<unsigned int,reco::CandidatePtr> ptrs;     
            for(unsigned int  i=0;i<old.size();i++)
            {
                //  jet.addDaughter(refToPtr((*pf2pc)[old[i]]));
                ptrs[((*pf2pc)[old[i]]).key()]=refToPtr((*pf2pc)[old[i]]);
            }
            for(std::map<unsigned int,reco::CandidatePtr>::iterator itp=ptrs.begin();itp!=ptrs.end();itp++) //iterate on sorted items
            {
                jet.addDaughter(itp->second);
            }


        }   
        if (dropSpecific_(*it)) {
            // FIXME add method in pat::Jet
            jet.specificCalo_.clear();    
            jet.specificPF_.clear();    
        }
        //         if (dropJetCorrFactors_(*it)) {
        //             // FIXME add method in pat::Jet
        //             jet.jetEnergyCorrections_.clear();
        //         }
    }

    iEvent.put(out);
}

#include "FWCore/Framework/interface/MakerMacros.h"
using namespace pat;
DEFINE_FWK_MODULE(PATJetSlimmer);